Nec POWERMATE 433D, POWERMATE 4100M, POWERMATE 466D, POWERMATE 466M SERVICE MANUAL

PROPRIETARY NOTICE AND LIABILITY DISCLAIMER

The information disclosed in this document, including all designs and related materials, is the valuable property of NEC Corporation (NEC) and/or its licensors. NEC and/or its licensors, as appropriate, reserve all patent, copyright and other proprietary rights to this document, including all design, manufacturing, reproduction, use, and sales rights thereto, except to the extent said rights are expressly granted to others.

The NEC product(s) discussed in this document are warranted in accordance with the terms of the Warranty Statement accompanying each product. However, actual performance of each such product is dependent upon factors such as system configuration, customer data, and operator control. Since implementation by customers of each product may vary, the suitability of specific product configurations and applications must be determined by the customer and is not warranted by NEC.

To allow for design and specification improvements, the information in this document is subject to change at any time, without notice. Reproduction of this document or portions thereof without prior written approval of NEC is prohibited.

MultiSync and PowerMate are U.S. registered trademarks of NEC Technologies, Inc.

FastFacts, NEC SVGA, PowerMate 433D PowerMate 466D, PowerMate 466M, and PowerMate 4100M are U.S. trademarks of NEC Technologies, Inc.

All other product, brand, or trade names used in this publication are the trademarks or registered trademarks of their respective trademark owners.

	First Printing — May 1994
Copyright 1994	Copyright 1994
NEC Technologies, Inc.	NEC Corporation
1414 Massachusetts Avenue	7-1 Shiba 5-Chome, Minato-Ku
Boxborough, MA 01719	Tokyo 108-01, Japan
All Rights Reserved	All Rights Reserved

	v
Contents
	Page
Preface ............................................................................................................................	xiii
Abbreviations ...................................................................................................................	xv
Section 1 Technical Information
Desktop System Unit ......................................................................................................	1-1
Minitower System Unit...................................................................................................	1-2
System Board .............................................................................................................	1-3
Processor ................................................................................................................	1-5
Secondary Cache ....................................................................................................	1-5
Flash ROM .............................................................................................................	1-6
Power Management ................................................................................................	1-7
I/O Addressing........................................................................................................	1-8
System Memory ......................................................................................................	1-9
Interrupt Controller.................................................................................................	1-9
Video Controller ...................................................................................................	1-10
Video Memory......................................................................................................	1-12
ISA/VL-Bus Backboard............................................................................................	1-14
ISA Bus ................................................................................................................	1-14
VL-Bus.................................................................................................................	1-14
Parallel Interface.......................................................................................................	1-15
Serial Interface .........................................................................................................	1-16
Indicator Panel..........................................................................................................	1-16
Power Supply ...............................................................................................................	1-17
Diskette Drive ..............................................................................................................	1-17
Hard Disk Drive ...........................................................................................................	1-17
Keyboard......................................................................................................................	1-17
Section 2 Setup and Operation
Unpacking and Repacking ..............................................................................................	2-1
Setup..............................................................................................................................	2-1
Minitower Setup.........................................................................................................	2-5
System Configuration .....................................................................................................	2-8
Setup Utility ...............................................................................................................	2-8
How to Start Setup.....................................................................................................	2-9
How to Use Setup ......................................................................................................	2-9
Menu Bar..............................................................................................................	2-10
Legend Bar ...........................................................................................................	2-11

vi Contents

Field Help Window ...............................................................................................	2-11
General Help Window...........................................................................................	2-12
Main Menu Options ..............................................................................................	2-12
IDE Adapters........................................................................................................	2-13
Memory Shadow...................................................................................................	2-14
Boot Sequence......................................................................................................	2-15
Numlock ...............................................................................................................	2-15
Advanced Menu........................................................................................................	2-16
Integrated Peripherals Menu..................................................................................	2-16
Parity ....................................................................................................................	2-17
Large Disk Access Mode ......................................................................................	2-18
Security Menu ..........................................................................................................	2-18
Power Menu .............................................................................................................	2-20
Exit Menu.................................................................................................................	2-21
Save Values & Exit ...............................................................................................	2-21
Discard Values & Exit...........................................................................................	2-21
Get Default Values................................................................................................	2-21
Load Previous Values ...........................................................................................	2-22
Save Current Values .............................................................................................	2-22
BIOS Update Utility .....................................................................................................	2-23
System Board Jumpers .................................................................................................	2-24
Section 3 Options
Internal Options..............................................................................................................	3-1
Desktop Cover Removal.............................................................................................	3-2
Minitower Cover Removal..........................................................................................	3-3
Expansion Board(s) ....................................................................................................	3-4
Desktop Expansion Board Installation.....................................................................	3-5
Minitower Expansion Board Installation..................................................................	3-7
Expansion Board Troubleshooting ..........................................................................	3-8
System Board Options ................................................................................................	3-9
OverDrive Processor Installation...........................................................................	3-10
OverDrive Processor Troubleshooting...................................................................	3-12
SIMM Memory Installation...................................................................................	3-13
SIMM Upgrade Path.............................................................................................	3-13
SIMM Installation.................................................................................................	3-15
SIMM Upgrade Kit Troubleshooting.....................................................................	3-16
Secondary Cache Installation.................................................................................	3-17
Secondary Cache Kit Troubleshooting ..................................................................	3-18
Video DRAM Module Installation.........................................................................	3-19
Video DRAM Module Troubleshooting ................................................................	3-20
Video Cache RAM Chip Installation .....................................................................	3-21
Video Cache RAM Chip Troubleshooting .............................................................	3-22

Contents vii

Optional 5 1/4-Inch Slot Devices ..................................................................................	3-23
5 1/4-Inch Diskette Drive..........................................................................................	3-23
5 1/4-Inch Diskette Drive Settings ............................................................................	3-23
Hard Disk Drives ......................................................................................................	3-24
Hard Disk Drive Settings ..........................................................................................	3-24
Desktop 5 1/4-Inch Device Installation .........................................................................	3-26
Desktop 3 1/2-inch Drive Bracket Removal ..............................................................	3-26
Desktop Blank Panel Removal ..................................................................................	3-27
Desktop 5 1/4-Inch Device Placement.......................................................................	3-28
Desktop 5 1/4-Inch Diskette Drive Cabling ...........................................................	3-29
Desktop 5 1/4-Inch Hard Disk Drive Cabling ........................................................	3-30
Finishing Desktop 5 1/4-Inch Device Installation.......................................................	3-31
Minitower 5 1/4-Inch Device Installation ......................................................................	3-31
Minitower Blank Panel Removal ...............................................................................	3-32
Minitower 5 1/4-Inch Device Placement....................................................................	3-34
Minitower 5 1/4-Inch Diskette Drive Cabling ........................................................	3-35
Minitower 5 1/4-Inch Hard Disk Drive Cabling .....................................................	3-36
Finishing Minitower 5 1/4-Inch Device Installation....................................................	3-37
Hard Disk Drive Troubleshooting .............................................................................	3-37
NEC SVGA Monitor ....................................................................................................	3-39
Connecting the Monitor ............................................................................................	3-40
Front Control Panel ..................................................................................................	3-42
Rear Control Panel ...................................................................................................	3-43
NEC SVGA Monitor Troubleshooting......................................................................	3-44
Section 4 Maintenance and Troubleshooting
Maintenance ...................................................................................................................	4-2
System Unit ................................................................................................................	4-2
Keyboard....................................................................................................................	4-3
Mouse ........................................................................................................................	4-4
Routine Checks ..........................................................................................................	4-4
Troubleshooting .............................................................................................................	4-5
Error Messages...........................................................................................................	4-5
Diagnosing and Solving Problems ...............................................................................	4-6
Diagnostic Output and Beep Codes...........................................................................	4-10
Section 5 Desktop Repair
Disassembly and Reassembly ..........................................................................................	5-1
Top Cover Removal ...................................................................................................	5-3
Expansion Board Removal..........................................................................................	5-4
ISA/VL-BUS Backboard Removal .............................................................................	5-7

viii Contents

Front Panel Assembly Removal...................................................................................	5-7
Power Button Cover Removal ....................................................................................	5-9
Speaker Assembly Removal ......................................................................................	5-10
SIMM Removal ........................................................................................................	5-11
3 1/2-inch Diskette and Hard Disk Drive Removal ....................................................	5-12
Optional 5 1/4-Inch Device Removal ........................................................................	5-14
5 1/4-Inch Device Cage Removal..............................................................................	5-15
Power Supply Removal.............................................................................................	5-16
System Board Removal.............................................................................................	5-17
Battery Removal.......................................................................................................	5-19
Illustrated Parts Breakdown......................................................................................	5-20
Section 6 Minetower Repair
Disassembly and Reassembly ..........................................................................................	6-1
Top Cover Removal ...................................................................................................	6-3
Expansion Board Removal..........................................................................................	6-5
ISA/VL-BUS Backboard Removal .............................................................................	6-6
Front Panel Assembly Removal...................................................................................	6-7
Power Button Cover Removal ....................................................................................	6-8
Speaker Assembly Removal ........................................................................................	6-9
SIMM Removal ........................................................................................................	6-10
3 1/2-inch Diskette Drive Removal ...........................................................................	6-11
3 1/2-inch Hard Disk Drive Removal ........................................................................	6-13
5 1/4-Inch Device Removal.......................................................................................	6-15
5 1/4-Inch Device Cage Removal..............................................................................	6-16
Power Supply Removal.............................................................................................	6-17
System Board Removal.............................................................................................	6-18
Battery Removal.......................................................................................................	6-20
Illustrated Parts Breakdown......................................................................................	6-21
Appendix A Connector Pin Assignments
Serial Interface Connectors............................................................................................	A-3
Parallel Interface Connector...........................................................................................	A-4
VGA Interface Connector Pin Assignments....................................................................	A-5
Speaker Connector Pin Assignments ..............................................................................	A-5
Power Supply Connectors..............................................................................................	A-6
Keyboard and Mouse Connectors ..................................................................................	A-6
Power Lamp Connector.................................................................................................	A-7
Hard Disk Drive Lamp Connector .................................................................................	A-7
Reset Button Connector ................................................................................................	A-7
Diskette Drive Interface Pin Assignments.......................................................................	A-8

Contents ix

IDE Interface Connectors ..............................................................................................		A-9
SIMM Sockets ............................................................................................................		A-10
Secondary Cache Socket .............................................................................................		A-11
ISA Expansion Bus Connector Pin Assignments ..........................................................		A-12
Appendix B Specifications
System Unit Specifications.............................................................................................		B-1
Power Supply Specifications..........................................................................................		B-3
Diskette Drive Specifications .........................................................................................		B-4
Hard Disk Specifications................................................................................................		B-5
NEC SVGA Monitor Specifications...............................................................................		B-6
List of Figures
1-1	PowerMate Desktop System Unit Features..........................................................	1-1
1-2	PowerMate Minitower System Unit Features ......................................................	1-2
2-1	Desktop Voltage Selector Switch........................................................................	2-2
2-2	Desktop Peripheral Connections..........................................................................	2-3
2-3	Desktop Lamps, Reset Button, And Power Button..............................................	2-3
2-4	Minitower Voltage Selector Switch.....................................................................	2-5
2-5	Minitower Peripheral Connections.......................................................................	2-6
2-6	Minitower Indicators, Reset Button, and Power Button.......................................	2-6
2-7	System Board Jumpers ......................................................................................	2-24
3-1	Desktop Cover Screws........................................................................................	3-2
3-2	Removing The Desktop Cover ............................................................................	3-2
3-3	Minitower Cover Screws.....................................................................................	3-3
3-4	Removing the Minitower Cover ..........................................................................	3-4
3-5	Desktop Expansion Slots.....................................................................................	3-5
3-6	Inside Expansion Slot Screw ...............................................................................	3-6
3-7	Removing the Inside Expansion Slot Bracket ......................................................	3-6
3-8	Minitower Expansion Slots .................................................................................	3-7
3-9	System Board Option Sockets.............................................................................	3-9
3-10	PGA/OverDrive Socket Lever...........................................................................	3-10
3-11	OverDrive Processor Alignment ........................................................................	3-11
3-12	SIMM Installation .............................................................................................	3-15
3-13	Secondary Cache Installation.............................................................................	3-17
3-14	Video DRAM Module Installation.....................................................................	3-19
3-15	Video Cache RAM Chip Installation..................................................................	3-24
3-16	OSDA-90C, 1.44-MB Diskette Drive................................................................	3-24
3-17	FD1158C, 1.2-MB Diskette Drive.....................................................................	3-24

x Contents

3-18	WDAC1270/2340/2420 270-, 340-, and 420-MB Hard Disk Drives ..................	3-25
3-19	CFS420 420-MB Hard Disk Drives...................................................................	3-25
3-20	3 1/2-Inch Drive Bracket Screws.......................................................................	3-26
3-21	Indicator Panel Connectors ...............................................................................	3-27
3-22	Desktop Blank Panel Removal ..........................................................................	3-28
3-23	Desktop 5 1/4-Inch Device Screws....................................................................	3-29
3-24	Desktop 5 1/4-Inch Diskette Drive Cables.........................................................	3-30
3-25	Desktop 5 1/4-Inch Hard Disk Drive Cables......................................................	3-31
3-26	Minitower Blank Panel Removal .......................................................................	3-32
3-27	Device Cage Slot Cover ....................................................................................	3-33
3-28	Minitower 5 1/4-Inch Device Screws.................................................................	3-34
3-29	Minitower 5 1/4-Inch Diskette Drive Cables......................................................	3-35
3-30	Minitower 5 1/4-Inch Hard Disk Drive Cables...................................................	3-36
3-31	Monitor Connections ........................................................................................	3-41
3-32	NEC SVGA Monitor Front Control Panel .........................................................	3-42
4-1	Removing the Keyboard Enclosure......................................................................	4-3
4-2	Removing the Mouse Ball Cover.........................................................................	4-4
5-1	Top Cover Screws ..............................................................................................	5-3
5-2	Removing the Top Cover ....................................................................................	5-4
5-3	Expansion Slot Screw .........................................................................................	5-5
5-4	Inside Expansion Slot Screw ...............................................................................	5-5
5-5	Removing The Expansion Slot L-Bracket............................................................	5-6
5-6	ISA/VL-Bus Backboard Screws..........................................................................	5-7
5-7	Indicator Panel Connectors .................................................................................	5-8
5-9	Speaker Screw ..................................................................................................	5-10
5-10	SIMM Socket ...................................................................................................	5-11
5-11	3 1/2-Inch Drive Bracket Screws.......................................................................	5-12
5-12	3 1/2-Inch Diskette and Hard Disk Drive Screws...............................................	5-13
5-13	5 1/4-Inch Device Screws..................................................................................	5-14
5-14	5 1/4-Inch Device Cage Screws.........................................................................	5-15
5-15	Power Button Screws .......................................................................................	5-16
5-16	Power Supply Screws .......................................................................................	5-17
5-17	System Board Connectors and Screws ..............................................................	5-18
5-18	Battery Replacement .........................................................................................	5-19
5-19	Powermate Desktop Illustrated Parts Breakdown ..............................................	5-22
6-1	Top Cover Screws ..............................................................................................	6-3
6-2	Removing the Top Cover ....................................................................................	6-4
6-3	Expansion Slot Screw .........................................................................................	6-5
6-4	ISA/VL-Bus Backboard Bracket Screws.............................................................	6-6
6-5	ISA/VL-Bus Backboard Screws..........................................................................	6-6
6-6	Front Panel Screws .............................................................................................	6-7
6-7	Power Button Tabs .............................................................................................	6-8

Contents xi

6-8	Speaker Tabs ......................................................................................................	6-9
6-9	SIMM Socket ...................................................................................................	6-10
6-10	3 1/2-Inch Diskette Drive Cables.......................................................................	6-11
6-11	Diskette Drive Bracket Screws..........................................................................	6-12
6-12	3 1/2-Inch Hard Disk Drive Cables....................................................................	6-13
6-13	Right Side Device Screws .................................................................................	6-14
6-14	Left Side Device Screw Access Holes ...............................................................	6-15
6-15	5 1/4-Inch Device Cage Screws.........................................................................	6-16
6-16	Power Button Screws .......................................................................................	6-17
6-17	Power Supply Screws .......................................................................................	6-18
6-18	System Board Connectors and Screws ..............................................................	6-19
6-19	Battery Replacement .........................................................................................	6-20
6-20	Powermate Minitower Illustrated Parts Breakdown...........................................	6-23
A-1	System Board Layout.........................................................................................	A-1
A-2	Serial Interface (P11/P12) ..................................................................................	A-3
A-3	Parallel Interface (P10).......................................................................................	A-4
A-4	Power Supply Connector (P3/P4) Pin Assignments ............................................	A-6
List of Tables
1-1	System Board Chips............................................................................................	1-4
1-2	System Memory Map ..........................................................................................	1-6
1-3	I/O Address Map ................................................................................................	1-8
1-4	Interrupt Level Assignments..............................................................................	1-10
1-5	Text Modes.......................................................................................................	1-12
1-6	Graphic Modes .................................................................................................	1-13
1-7	Parallel Port Addressing and Interrupts .............................................................	1-15
1-8	Serial Port Addressing and Interrupts ................................................................	1-16
2-1	Setup Key Functions .........................................................................................	2-11
2-2	Legend Bar Main Menu Parameters ..................................................................	2-12
2-3	IDE Hard Disk Parameters................................................................................	2-14
2-4	Memory Shadow Parameters.............................................................................	2-14
2-5	Boot Parameters ...............................................................................................	2-15
2-6	Numlock Parameters .........................................................................................	2-16
2-7	Integrated Peripherals Parameters .....................................................................	2-17
2-8	Large Disk Parameters ......................................................................................	2-18
2-9	System Security Options ...................................................................................	2-19
2-10	Power Management Parameters ........................................................................	2-20
2-11	System Configuration Jumpers ..........................................................................	2-25
3-1	Expansion Board Problems and Solutions..........................................................	3-11
3-2	OverDrive Problems and Solutions....................................................................	3-12

xii Contents

3-3	SIMM Configurations .......................................................................................	3-14
3-4	SIMM Upgrade Problems and Solutions............................................................	3-16
3-5	Secondary Cache Problems and Solutions .........................................................	3-18
3-6	Video DRAM Module Problems and Solutions .................................................	3-20
3-7	Video Cache RAM Chip Problems and Solutions ..............................................	3-22
3-8	Optional 5 1/4-Inch Device Problems and Solutions ..........................................	3-38
3-9	NEC SVGA Monitor Problems and Solutions ...................................................	3-44
4-1	NEC Service and Information Telephone Numbers..............................................	4-1
4-2	BIOS Update Utility Error Messages ..................................................................	4-5
4-3	Problems and Solutions .......................................................................................	4-6
4-4	Diagnostic Output and Beep Codes ...................................................................	4-10
4-5	Diagnostic Output and Beep Codes Looped On Post.........................................	4-12
5-1	Powermate Desktop Disassembly Sequence ........................................................	5-1
5-2	Connector Identifiers.........................................................................................	5-18
5-3	Powermate Desktop Field-Replaceable Parts List ..............................................	5-20
5-4	Powermate Desktop Options.............................................................................	5-23
5-5	Powermate Desktop Documentation and Packaging ..........................................	5-24
6-1	Powermate Minitower Disassembly Sequence .....................................................	6-1
6-2	Connector Identifiers.........................................................................................	6-19
6-3	Powermate Minitower Field-Replaceable Parts List ...........................................	6-21
6-4	Powermate Minitower Options..........................................................................	6-24
6-5	Powermate Minitower Documentation and Packaging .......................................	6-25
A-1	System Board Connector Descriptions ...............................................................	A-2
A-2	Video Connector (P8) Pin Assignments..............................................................	A-5
A-3	Speaker Connector (P6) Pin Assignments...........................................................	A-5
A-4	Keyboard (P1) and Mouse (P2) Connector Pin Assignments...............................	A-6
A-5	Power Lamp Connector (P5) Pin Assignments ...................................................	A-7
A-6	Hard Disk Drive Busy Lamp Connector (P7) Pin Assignments ...........................	A-7
A-7	Reset Button Connector (P5) Pin Assignments ...................................................	A-7
A-8	Diskette Drive Connector (P13) Pin Assignments...............................................	A-8
A-9	IDE Connector Pin Assignments (P8/P14)..........................................................	A-9
A-10	SIMM Socket Pin Assignments ........................................................................	A-10
A-11	Secondary Cache Pin Assignments (U49) .........................................................	A-11
A-12	ISA Expansion Slot Pin Assignments................................................................	A-12
B-1	System Unit Specifications .................................................................................	B-1
B-2	Power Supply Input Requirements .....................................................................	B-3
B-3	Power Supply Output Specifications ..................................................................	B-3
B-4	Specifications for Diskette Drives.......................................................................	B-4
B-5	Specifications for 270-, 340-, 420-, and CFS420-MB Hard Disk Drives .............	B-5
B-6	NEC SVGA Monitor Specifications ...................................................................	B-6

Contents xiii

xiii

Preface

This service and reference manual contains the technical information necessary to set up, maintain, troubleshoot, and repair the NEC PowerMate® 433D, PowerMate 466D, PowerMate 466M, and PowerMate 4100M computer systems. It also provides hardware and interface information for users who need an overview of the computer system design. The manual is written for NEC-trained customer engineers, system analysts, service center personnel, and dealers.

The manual is organized as follows:

Section 1, Technical Information, provides an overview of the computer features, hardware design, interface ports and internal devices.

Section 2, Setup and Operation, takes the user from unpacking to setup and operation. Included is a description of the system configuration, system password, and the computer’s jumper settings, including the factory default settings.

Section 3, Options, provides the user with installation and troubleshooting information for each specific option.

Section 4, Maintenance and Troubleshooting, includes recommended maintenance information and lists possible problem and solutions for computer.

Section 5, Desktop Repair, includes a list of NEC service information and telephone numbers that provide access to the NEC Bulletin Board System (BBS), FastFacts, and Technical Information Bulletins. Included are desktop disassembly and reassembly procedures along with an illustrated parts breakdown. NEC service and spare parts ordering information is also provided.

Section 6, Minitower Repair, includes a list of NEC service information and telephone numbers that provide access to the NEC Bulletin Board System (BBS), FastFacts, and Technical Information Bulletins. Included are minitower disassembly and reassembly procedures along with an illustrated parts breakdown. NEC service and spare parts ordering information is also provided.

Appendix A, Connector Pin Assignments, provides a list of the system boards' internal connector pin assignments and a list of external pin assignments for the keyboard/mouse, serial port, parallel port, and video port.

Appendix B, Specifications, provides specifications for the system unit, power supply, diskette drives, hard disk drives, and optional NEC SVGA Monitor.

xv

Abbreviations

A	ampere
AC	alternating current
AT	advanced technology
	(IBM PC)
BBS	Bulletin Board System
BCD	binary-coded decimal
BCU	BIOS Customized Utility
BIOS	basic input/output system
bit	binary digit
BUU	BIOS Upgrade Utility
bpi	bits per inch
bps	bits per second
C	capacitance
C	centigrade
Cache	high-speed buffer storage
CAM	constantly addressable memory
CAS	column address strobe
CD-ROM	compact disk-ROM
CG	character generator
CGA	Color Graphics Adapter
CGB	Color Graphics Board
CH	channel
clk	clock
cm	centimeter
CMOS	complementary metal oxide
	semiconductor
COM	communication
CONT	contrast
CPGA	ceramic pin grid array
CPU	central processing unit
DAC	digital-to-analog converter
DACK	DMA acknowledge
DC	direct current
DIP	dual in-line package
DLAB	Divisor Latch Address bit
DMA	direct memory access

DMAC	DMA controller
DOS	disk operating system
DRAM	dynamic RAM
DTE	data terminal equipment
ECC	error checking and correction
EGA	Enhanced Graphics Adapter
EPROM	erasable and programmable
	ROM
EVGA	Enhanced Video Graphics
	Array
F	Fahrenheit
FCC	Federal Communications
	Commission
FG	frame ground
FM	frequency modulation
FRU	field-replaceable unit
GB	gigabyte
GND	ground
HEX	hexadecimal
HGA	Hercules Graphics Adapter
Hz	hertz
IC	integrated circuit
ID	identification
IDE	intelligent device electronics
IDTR	interrupt descriptor table
	register
in.	inch
INTA	interrupt acknowledge
IPB	illustrated parts breakdown
IRR	Interrupt Request register
ISA	Industry Standard Architecture
ISR	In Service register
I/O	input/output
IPC	integrated peripheral controller
ips	inches per second
IRQ	interrupt request

xvi Abbreviations

K	kilo (1024)	QFP	quad flat pack
k	kilo (1000)	RAM	random-access memory
KB	kilobyte	RAMDAC	RAM digital-to-analog
kg	kilogram	RAS	row address strobe
kHz	kilohertz	RGB	red green blue
lb	pound	RGBI	red green blue intensity
LED	light-emitting diode	ROM	read-only memory
LSB	least-significant bit	rpm	revolutions per minute
LSI	large-scale integration	R	read
M	mega	RTC	real-time clock
mA	milliamps	R/W	read/write
max	maximum	S	slave
MB	megabyte	SG	signal ground
MDA	Monochrome Display Adapter	SIMM	single inline memory module
MFM	modified frequency modulation	SVGA	Super Video Graphics Array
MHz	megahertz	SW	switch
mm	millimeter	TAC	Technical Assistance Center
ms	millisecond	TSC	Technical Support Center
MSB	most-significant bit	TTL	transistor/transistor logic
NASC	National Authorized Service	tpi	tracks per inch
	Center	V	volt
NC	not connected	Vdc	volts, direct current
NMI	Non-maskable Interrupt	VESA	video electronics standards
ns	nanosecond		association
NSRC	National Service Response	VGA	Video Graphics Array
	Center	VRAM	virtual RAM
PAL	programmable array logic	W	watt
PC	personal computer	W	write
PCB	printed circuit board
PFP	plastic flat package
PIO	parallel input/output
pixel	picture element
PLCC	plastic lead chip carrier
PLL	phase lock loop
p-p	peak-to-peak
PPI	programmable peripheral
	interface
PROM	programmable ROM

Section 1

Technical Information

The PowerMate® Series includes the PowerMate 433D, PowerMate 466D, Power-

Mate 466M, and PowerMate 4100M. The information in this manual applies to all models except where indicated. Models differ primarily in the chassis, and microprocessor.

This section provides an overview of the PowerMate Series hardware. The basic hardware for the system includes a system unit, keyboard, and mouse. The “D” in the model name refers to a desktop style chassis and the “M” refers to the minitower style chassis.

External interface connectors are located in the rear of the system unit and are identified in Section 2, Setup and Operation. Jumper settings for all of the internal boards are also provided in Section 2. Appendix A provides the system unit connector pin assignments and Appendix B provides specifications.

An overview of each of the two system unit styles are described in the following subsections.

DESKTOP SYSTEM UNIT

The desktop chassis provides an enclosure for the system board, power supply, four storage device slots, and a five-expansion-slot ISA/VESA Local Bus (VL-Bus™) backboard. The storage device slots accommodate a 3 1/2-inch diskette drive, a 3 1/2-inch hard disk (1-inch height), and two 5 1/4-inch storage devices (1.6-inch height). The system ships with a

3 1/2-inch diskette drive and a hard disk drive leaving two 5 1/4-inch storage device slots available for optional devices. All desktop models share the system unit features shown in Figure Section 1-1.

5 1/4-Inch Accessible

Slots (available)

Power Button

Power Lamp
Hard Disk Drive	3 1/2-Inch Internal
Busy Lamp	Hard Disk Drive Slot
Reset Button
	3 1/2-Inch Accessible
	Slot (contains 1.44-MB
	diskette drive)

Figure Section 1-1 PowerMate Desktop System Unit Features

1-2 Technical Information

MINITOWER SYSTEM UNIT

The minitower chassis provides an enclosure for the system board, power supply, five storage device slots, and five-expansion-slot ISA/VL-Bus backboard. The storage device slots accommodate a 3 1/2-inch diskette drive, a 3 1/2-inch hard disk (1-inch height), and three

5 1/4-inch storage devices (1.6-inch height). The system ships with a 3 1/2-inch diskette and a hard disk drive leaving three 5 1/4-inch storage device slots available for optional devices.

All minitower models share the system unit features shown in Figure Section 1-2.

Power Lamp

Hard Disk

Drive Busy

Lamp

Reset Button

Power Button

3 1/2-Inch Accessible slot (contains 1.44-MB diskette drive)

5 1/4-Inch Accessible slots

3 1/2-Inch Internal Slot (contains hard disk)

Figure Section 1-2 PowerMate Minitower System Unit Features

Technical Information	1-3

System Board

The system boards are similar, differing only in the processor. The system board contains a Flash ROM which is upgradeable through the BIOS Update utility (see Section 2).

Key features of the system board are listed below.

nprocessor

¾Intel486SX™-33 – PowerMate 433D™

¾Intel486DX2™-66 – PowerMate 466D™

¾Intel486DX2-66 – PowerMate 466M™

¾Intel486DX4™-100 – PowerMate 4100M™

nsupport for Intel OverDrive™ processor upgrades

n4 megabytes (MB) of random access memory (RAM) in the SX an DX2 systems and 8 MB in the DX4 systems

¾accepts 36-bit (32-bit U.S. and Canada), 70-nano second (ns) single-inline memory modules (SIMMs)

¾expandable to 128 MB

n8-kilobyte (KB) primary cache (16 KB in the Intel486DX4)

noptional 256-KB secondary cache module

nWingine video graphics array (VGA) controller and 32-bit Local Bus

¾supports 640 x 480 with 16.8 million colors (24-bit true color), 800 x 600 with 64 K colors 1024 x 768 resolution with 256 colors, and 1280 x 1024 resolution with 16 colors

¾1-MB (two 256K x 16) video dynamic RAM (DRAM), expandable to 2 MB

¾128-KB (256K x 4) standard video cache, expandable 256-KB

ntwo intelligent drive electronics (IDE) interface connectors

¾one fast local bus IDE connector (primary interface) used by the hard disk drive to transfer data at the hard disk's optimum rate

¾one standard IDE connector (secondary interface) for additional IDE devices (not used)

1-4 Technical Information

nenergy saving features: system switches to power save mode when idle for an established amount of time

n3 1/2-inch, 1.44-MB diskette drive

nISA/VL-Bus backboard providing four ISA and one ISA/VL-Bus expansion slots

nexternal connectors providing an interface for the following external devices:

¾VGA-compatible monitor

¾personal system/2 (PS/2® )-style mouse

¾PS/2-style keyboard

¾enhanced capabilities port (ECP) for the parallel printer

¾two buffered serial ports

Table Section 1-1 lists the major chips on the system board. See Section 2, Setup and Operation, for a description of the system board's jumpers. See Appendix A, Connector Pin Assignments, for a list of the system board connectors.

Table Section 1-1 System Board Chips

Chip	Description
486SX – PowerMate 433D	33-MHz processor
486DX2 – PowerMate 466D and	33/66-MHz processor
PowerMate 466M
486DX4 – PowerMate 4100M	33/100-MHz processor
28F010	128k x 8 Flash ROM
VL82C483	System/cache/ISA Controller
VL82C003	Interrupt, I/O controller
VL82C114A	Combination , I/O controller
VL82C611	VL-Bus controller
64300 Wingineâ	VGA controller

Technical Information	1-5

Processor

The PowerMate systems use the following processors.

nPowerMate 433D – uses the 486SX with a 33 MHz clock speed

nPowerMate 466D and 466M – use the 486DX2 with a 66-MHz internal clock speed and a 33-MHz external clock speed.

nPowerMate 4100M – use the 486DX4 with a 100-MHz internal clock speed and a 33-MHz external clock speed.

The processors are advanced 32-bit processors designed to optimize multitasking operating systems. The 32-bit registers and data paths support 32-bit addresses and data types.

The processor is installed in a 237-pin, zero-insertion-force (ZIF) processor socket. This socket allows the installation of the 486SX, DX2 and DX4 processors and the next generation of Intel OverDrive processors based on the Pentium core (PGA type package). When upgrading processors they must operate with and external clock of 25 or 33 MHz.

The 486DX2 is exactly like previous 486DXs except that it runs twice as fast internally. When the interface bus portion of the DX2 accesses main memory, executes I/O instructions, or accesses one of the other chips on the system board, the DX2 operates at 33 MHz. The DX2 works at 66 MHz when accessing its internal registers, refers to a memory location alPowerMate mapped into its internal cache, or performs a floating-point operation and CPU operations.

The DX4 runs three times as fast internally. When the interface portion accesses external registers it operates at 33 MHz and works at 100 MHz when accessing its internal registers.

Secondary Cache

The 8-KB primary cache (16-KB of primary cache in the DX4) is integrated into the processor. The system board provides an 80-pin SIMM socket for an optional 256 KB of secondary cache, external to the processor. Cache memory improves read performance by holding copies of code and data that are frequently requested from the system memory by the processor. Cache memory is not considered part of the possible 128 MB of total memory capacity.

The cache is connected directly to the processor address bus and uses physical addresses. A bus feature known as burst enables fast cache fills. Memory areas (pages) can be designated as cacheable or non-cacheable by software. The cache can also be enabled and disabled by software.

The write strategy of the cache (primary and secondary) is write-through. If the write is a cache hit, an external bus cycle is generated and information is written to the cache. Any area of memory can be cached in the system. Non-cacheable portions of memory are defined by software. The cache can be cleared by software instructions.

1-6 Technical Information

Flash ROM

Machine language programs are stored in a 28F010 Flash ROM known as the system's ROM BIOS. The system BIOS and video BIOS are contained in the ROM. The Flash ROM is 128 KB, which consists of 64 KB of system BIOS, and 32 KB of video BIOS.

The Flash ROM allows the BIOS to be upgraded with the BIOS Update utility without removing the ROM (see Section 2, Setup and Configuration). The BIOS can only be reprogrammed by powering on the system with the BIOS Update utility diskette in Drive A.

The BIOS programs execute the Power-On Self-Test, initialize processor controllers, and interact with the display, diskette drives, hard disks, communication devices, and peripherals. The system BIOS also contains the Setup program and provides VGA controller support. The hardware setup default copies the ROM BIOS into RAM (shadowing) for maximum performance.

System BIOS is located in the upper portion of the Flash ROM and video BIOS in the lower portion. System BIOS is located between F0000h-FFFFFh and supports shadowing and shadowed memory. System BIOS is write protected and automatically enabled.

Video BIOS is located between C0000h and C7FFFh. If the internal video is disabled, this range is mapped to ISA. The system memory map in shown in Table Section 1-2.

Table Section 1-2 System Memory Map

Memory Space	Size	Function
000000-07FFFF	512 KB	Reserved for system base memory
080000-09FFFF	128 KB	Mapped to either system base memory or ISA bus*
0A0000-0BFFFF	128 KB	Mapped to either on-board video memory or ISA video memory
0C0000-0C7FFF	32 KB	Mapped to either on-board video BIOS or ISA video BIOS
0C8000-0EFFFF	160 KB	Mapped to ISA bus
0F0000-0FFFFF	64 KB	Reserved for system BIOS
100000-FDFFFF	14.9 MB	Reserved for Extended and/or Expanded system memory
FE0000-FFFFFF	128 KB	Mapped to ISA bus
1000000- On-Board	14.9 MB	Reserved for Extended and/or Expanded system memory

*Always non-cachable.

Technical Information	1-7

Flash ROM supports the reprogramming of the system and built-in video BIOS. Software controls this feature via port 94h. Flash ROM programming writes to location 0F0000h0FFFFFh. This range allows access to 64 KB of the 128 KB ROM. To write to the rest of the ROM, bit 3 of port 94h must be set. Again, writing to 0F0000h-0FFFFFh allows the rest of the ROM to be programmed. (Setting bit 3 on port 94h maps the 0F0000h to 0E0000h range.)

Power Management

Each computer system incorporates power management features that lowers power consumption when there is no activity detected from the keyboard, mouse, diskette drive, CDROM reader, or hard disk drive after a pre-defined period of time. As soon as activity is detected the system resumes where it left off.

When Power Management is enabled the computer automatically activates power-saving features and enters a sleep mode whenever inactivity is sensed. The computer's powersaving functions are as follows.

nReduces the CPU clock speed

The CPU clock speed is changed from 33 MHz to 8 MHz (16 MHz in the PowerMate 4100M) to put the computer in sleep mode. The cache and video clocks are changed at the same time.

nBlanks out the monitor

Puts the video controller into sleep mode. The vertical sync clock and blank signals to the monitor are disabled.

nForces the IDE devices into stand-by mode

A suspend command is sent to the IDE devices which put the devices into a stand-by mode.

1-8 Technical Information

I/O Addressing

The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex) addresses of I/O devices are listed in Table Section 1-3.

	Table Section 1-3 I/O Address Map
Address (Hex)	I/O Device Name
000-01F	DMA controller 1 (channel 0-3)
020-03F	Interrupt controller
040-05F	Timer
060-063	PPI (Programmable Peripheral Interface) keyboard, equipment switches,
	timer
060-06F	Keyboard controller
070-07F	Real-time clock, CMOS memory, NMI mask
080	Manufacturer's diagnostic checkpoint
081-09F	DMA page register
0A0-0AF	NMI (non-maskable interrupt) mask
092	PS/2 alternate Fast A20 Gate, Hot Reset
094	Extended system port (NEC-specific hardware setup)
095	Extended system port (NEC-specific hardware setup)
097	Extended system port (NEC-specific hardware setup)
0A0-0BF	Interrupt controller 2
0C0-0DF	DMA controller 2 (channel 4-7)
0E0-0EF	Reserved
170-177	2nd hard disk
1F0-1F7	1st hard disk
1F9-1FF	Reserved
200-207	Game I/O adapter (not available)
278-27F	2nd parallel port (3rd with DMA)
2F8-2FF	2nd asynchronous communications port
370-377	Diskette controller 2
378-37F	1st parallel port (2nd with DMA)
3A0-3AF	Primary bisynchronous communications port
3B0-3DF	Video Graphics Array (VGA)
3B0-3BF	Monochrome display adapter/printer 1
3C0-3CF	Enhanced Graphics Adapter (EGA) 1

Technical Information	1-9

	Table Section 1-3 I/O Address Map
Address (Hex)	I/O Device Name
3D0-3DF	Color/Graphics Adapter (CGA and EGA)
3F0-3F7	Diskette Controller
3F8-3FF	Asynchronous Adapter Port 1

System Memory

The PowerMate 433D, 466D, and 466M system boards come standard with 4 MB of RAM. The PowerMate 4100M system board comes standard with 8 MB of RAM. The first megabyte includes the standard 640 KB of base memory. The remaining memory is extended memory. Four SIMM sockets are integrated on the system board. In the 433D, 466D, and 466M, one socket contains a 4-MB SIMM and three sockets are empty for installing up to three additional SIMMs. The 4100M contains two 4-MB SIMMs and two sockets are empty for installing additional SIMMs. The maximum possible memory is 128 MB.

The SIMM memory sockets accept 4-, 8-, 16-, or 32-MB SIMMs. When the standard 4-MB SIMM is removed (8-MB in the 4100M), four 32-MB SIMMs may be installed for a total of 128 MB. High-speed RAM is 32 bits wide (no parity bits). SIMMs are 1 MB x 32 bit (4 MB), 4 MB x 32 bit (16 MB), and 8 MB x 32 bit (32 MB). There are no switches or jumpers to set when SIMMs are added.

CAUTION: SIMMs must match the tin metal plating used on the system board SIMM sockets. When adding SIMMs, use tin-plated SIMMs.

SIMMs install directly on the system board. Different size SIMMs may be intermixed. Each SIMM is inserted into a socket or bank. The standard 4 MB of memory is installed in bank 0 in the PowerMate 433D, 466D, and 466M. The PowerMate 4100M has two 4 MB SIMMs installed in banks 0 and 1. The system board's four SIMM sockets are assigned as banks 0 through 3. See Section 3, Options, for installation instructions and SIMM memory configurations.

Interrupt Controller

The interrupt controller operates as an interrupt manager for the entire AT system environment. The controller accepts requests from peripherals, issues interrupt requests to the processor, resolves interrupt priorities, and provides vectors for the processor to determine which interrupt routine to execute. The interrupt controller has priority assignment modes that can be reconfigured at any time during system operations.

1-10 Technical Information

The interrupt levels are described in Table Section 1-4. Interrupt-level assignments 0 through 15 are in order of decreasing priority. See Section 2, Setup and Configuration, for information on changing the interrupts using Setup and jumpers.

Table Section 1-4 Interrupt Level Assignments

	Interrupt Priority	Interrupt Device
	IRQ00	Counter/Timer
	IRQ01	Keyboard
	IRQ02	Cascade (INT output from slave)
	IRQ03	COM2*
	IRQ04	COM1*
	IRQ05	Available
	IRQ06	Diskette Drive Controller*
	IRQ07	Parallel Port 1*
	IRQ08	Real-time clock
	IRQ09	Available
	IRQ10	Available
	IRQ11	Available
	IRQ12	PS/2 mouse*
	IRQ13	Coprocessor
	IRQ14	Primary IDE (fast)
	IRQ15	Secondary IDE (standard)
*Industry standard locations

Video Controller

The 64300 Wingine DGX video controller with Local Bus video combines powerful elements aimed at addressing the requirements of personal computer designs. State of the art techniques have been added for optimizing performance in computer graphic intensive applications and graphical user interfaces (GUI). A variety of industry standard 32-bit local bus interfaces are integrated on chip, including VESA Local Bus (VL-Bus). The key is that local bus interfaces are 32-bit wide.

Included in the video controller are cost saving features such as an integrated palette DAC and clock synthesizer along with integrated support for multiple bus interfaces and flexible DRAM-based display memory configurations.

Technical Information 1-11

The 64300 video controller supports XRAM Accelerator Cache, power management, flash ROM, and a linearly mapped display.

The XRAM Accelerator Cache is a breakthrough in performance technology. By using one standard 256K x 4 fast page DRAM, a proprietary algorithm implemented in the 64300 significantly increases graphics system performance. Performance never before achieved in standard dram-based graphics architectures.

When using the 64300 Wingine DGX, a system host CPU’s performance is enhanced and a significant improvement will be observed in the display. Other DRAM-based graphics accelerators gain some degree of performance which, while measurable, is not as significant nor as noticeable on the display.

The TrueColor RAMDAC provides 24-bit true color. The integrated dual clock synthesizer allows full programmability of MCLK (memory clock) and PCLK (pixel clock). The integrated clock synthesizer supports frequencies from 390 kHz to 120 MHz. The 64300 supports up to 2 MB of display memory. The video memory is 256K x 16 Fast Page Mode DRAM. Display memory is linearly mapped up to 2 MB.

The VESA display power management signaling (DPMS) standard is supported, enabling stand-by, suspend, and off power saving modes. This includes the ability to independently stop HSYNC of VSYNC and hold them at a static level. Additionally the RAMDAC may be powered-down and the clock frequencies lowered for further power savings. Color Key and video overlay are supported.

1-12 Technical Information

Video Memory

The 1 MB of on-board video DRAM is expandable to 2 MB and provides graphic resolutions of or 640 x 480 with 16.8 million colors, 800 x 600 with 64K colors, 1024 x 768 with 256 colors, or 1280 x 1024 with 16 colors. Table Section 1-5 and Table Section 1-6 provide the different display modes for the video controller.

Table Section 1-5 Text Modes

					Video	Horiz
Mode		Column/			Clock	Sync	Vert Sync
(Hex)	Colors	Rows	Buffer	Resolution	(MHz)	(kHz)	(Hz)
001	16 (grey)	40 x 25	B8000	320 x 200	28.2	31.7	70
002	16 (grey)	40 x 25	B8000	320 x 350	28.3	31.7	70
003	16	40 x 25	B8000	360 x 400	28.2	31.7	70
011	16	40 x 25	B8000	320 x 200	28.2	31.7	70
012	16	40 x 25	B8000	320 x 350	28.2	31.7	70
013	16	40 x 25	B8000	360 x 400	28.2	31.7	70
021	16(grey)	80 x 25	B8000	640 x 200	28.2	31.7	70
022	16(grey)	80 x 25	B8000	640 x 350	28.2	31.7	70
023	16	80 x 25	B8000	720 x 400	28.2	31.7	70
031	16	80 x 25	B8000	640 x 200	28.2	31.7	70
032	16	80 x 25	B8000	640 x 350	28.2	31.7	70
033	16	80 x 25	B8000	720 x 400	28.2	31.7	70
074	mono	80 x 25	B8000	720 x 350	28.2	31.5	70
073	mono	80 x 25	B8000	720 x 400	28.2	31.5	70
605	16	132 x 25	B8000	1056 x 400	40.0	30.5	67.5
245	16	132 x 30	B8000	1056 x 400	40.0	30.5	67.5

1CGA-style text mode with 8x8 character size and 200 lines vertical resolution.

2EGA-style text mode with 8x14 and 9x14 character sizes and 350 lines vertical resolution. 3VGA-compatible text mode with 9x16 character size and 400 lines vertical resolution. 4MDAstyle text mode with 9x14 character sizes and 350 lines vertical resolution. 5Enhanced VGA mode.

Technical Information 1-13

			Table Section 1-6		Graphic Modes
						Video	Horiz	Vert
	Mode		Column			Clock	Sync	Sync
	(Hex)	Colors	/Rows	Buffer	Resolution	(MHz)	(kHz)	(Hz)
	041	4	40 x 25	B8000	320 x 200	25.2	31.5	70
	051	4	40 x 25	B8000	320 x 200	25.2	31.5	70
	061	2	80 x 25	B8000	640 x 200	25.2	31.5	70
	0D1	16	40 x 25	A0000	320 x 200	25.2	31.5	70
	0E1	16	80 x 25	A0000	640 x 200	25.2	31.5	70
	0F2	mono	80 x 25	A0000	640 x 350	25.2	31.5	70
	102	16	80 x 25	A0000	640 x 350	25.2	31.5	70
	112	2	80 x 30	A0000	640 x 480	25.2	31.5	70
	122	16	80 x 30	A0000	640 x 480	25.2	31.5	60
	132	256	40 x 25	A0000	320 x 200	25.2	31.5	70
	202	16	80 x 30	B8000	640 x 480	40.0	30.5	60
	222	16	100 x 37	A0000	800 x 600	25.2	31.5	60
	242,3	16	128 x 48	A0000	1024 x 768	32.6	31.5	73
	302	256	80 x 30	A0000	640 x 480	36.0	35.5	56
	322	256	100 x 37	A0000	800 x 600	40.0	38.0	60
	342,3	256	128 x 48	A0000	1024 x 768	50.4	48.4	73
	382,3	256	80 x 25	A0000	1280 x 1024	25.2	31.5	70
	402	32k	80 x 30	A0000	640 x 480	25.2	31.5	60
	412	64k	80 x 30	A0000	640 x 480	32.6	31.5	73
	422,	32k	100 x 37	A0000	800 x 600	25.2	31.5	70
	432,	64k	100 x 37	A0000	800 x 600	36.0	35.5	56
	442,3	32k	128 x 48	A0000	1024 x 768	40.0	38.0	60
	452,3	64k	128 x 48	A0000	1024 x 768	50.4	48.4	73
	502	16M	80 x 30	A0000	640 x 480	44.9	35.5	87
	6A2	16	100 x 37	A0000	800 x 600	65.0	49.0	61
	702	16	100 x 37	A0000	800 x 600	72.0	56.6	70
	752,3	16	128 x 48	A0000	1024 x 768	44.9	35.5	87
	763	16	160 x 64	A0000	1280 x 1024	72.0	56.6	70
	782	256	80 x 25	A0000	640 x 400	72.0	56.6	70
	792	256	80 x 30	A0000	640 x480	44.9	35.5	87

	1-14	Technical Information
			Table Section 1-6		Graphic Modes
						Video	Horiz	Vert
	Mode		Column			Clock	Sync	Sync
	(Hex)	Colors	/Rows	Buffer	Resolution	(MHz)	(kHz)	(Hz)
	7C2	256	100 x 37	A0000	800 x 600	72.0	56.6	70
	7E2,3	256	128 x 48	A0000	1024 x 768	80.0	48.1	87

18x8 charactor size

28x16 charactor size

3Interlaced

ISA/VL-Bus Backboard

The ISA/VL-Bus backboard provides four ISA expansion slots and one Video Electronics Standards Association (VESA) Local Bus (VL-Bus) slots. The backboard is plugged into two bus connectors on the system board.

ISA Bus

The system board uses the ISA bus for transferring data between the processor and I/O peripherals and expansion boards. The ISA bus supports 8- and 16-bit data transfers and typically operates at 8.33 MHz. A connector is provided on the system board for attaching the ISA/VL-Bus backboard.

VL-Bus

The VL-Bus provides an interface between the system's local bus and a VL-Bus option board (graphics adapters, disk controllers, network cards, and so on). The VL-Bus uses a standard 32-bit VESA connector and conforms with the VESA 1.1 local bus specification, providing a set of standards that ensure compatible VL-Bus option boards. The boards operate at the system clock speed (33 MHz) with 0 wait states. The VL-Bus slot can support bus masters simultaneously.

Option boards on the VL-Bus can send and receive data much faster on the local bus than on the ISA bus. The VL-Bus runs at the system's clock speed (33 MHz) instead of the standard ISA bus speed (8 MHz). Also, the Local Bus provides a wider bus width (32 bits) than the standard ISA bus width (16 bits).

The VL-Bus slot is used in conjunction with an ISA bus slot. This feature allows a VL-Bus option board full access to the ISA bus. For example, the VL-Bus option board may utilize the parallel port via the ISA bus, or use the ISA bus REFRESH signal. Use of the ISA bus is optional, as the VL-Bus has all signals needed to fully support a VL-Bus option board.

Technical Information 1-15

Parallel Interface

The system has a 25-pin parallel port on the system board. Specifications for this port conform to the IBM-PC standards.

The BIOS has automatic ISA printer port sensing. If the BIOS detects an ISA printer port mapped to the same address, the built-in printer port is disabled. The BIOS also sets the first parallel interface port it finds as LPT1 and the second port it finds as LPT2. The interrupt is selected to either IRQ5 or IRQ7 via the Setup and jumper settings.

Interrupt levels for the parallel port are given in Table Section 1-7. Software selectable base addresses are 3BCh, 378h, and 278h.

Parallel interface signals are output through the system board's 25-pin, D-subconnector. The connector is located at the rear of the system unit. Pin locations for the parallel interface connector are shown in Appendix A.

NOTE: Any interrupts used for the built-in parallel port is not available for ISA parallel ports.

Table Section 1-7 Parallel Port Addressing and Interrupts

Starting I/O Address	Interrupt Level	Port
378	IRQ05	LPT1
278	IRQ05	LPT1 or LPT2
3BC	IRQ05	LPT1 or LPT2
378*	IRQ07	LPT1
278	IRQ07	LPT1 or LPT2
3BC	IRQ07	LPT1 or LPT2
*Default for parallel port

1-16 Technical Information

Serial Interface

The system has two standard serial ports (COM1 and COM2). The serial ports support the standard RS-232C interface (16550 compatible). I/O addresses and interrupt levels for the two channels are given in Table Section 1-8. The interrupt is selectable via Setup to either IRQ3 or IRQ4. Software selectable base addresses are 3F8h, 2F8h, 3E8h, and 2E8h. Serial interface signals are output through the system board's 9-pin, D-subconnector. The connectors are located at the rear of the system unit. Pin locations for the serial interface connector are shown in Appendix A

NOTE: Any interrupts used for the built-in serial ports are not available for ISA parallel ports.

Table Section 1-8 Serial Port Addressing and Interrupts

Starting I/O Address	Interrupt Level	Port
3F8	IRQ04	COM1
2F8*	IRQ03	COM2
3E8	IRQ04	COM3
2E8	IRQ03	COM4

*Default for serial port

Serial interface specifications include:

nBaud rate up to 19.2 KB per second

nWord length - 5, 6, 7, or 8 bits

nStop bit - 1, 1.5, or 2 bits

nStart bit - 1 bit

nParity bit - 1 bit (odd parity or even parity).

Indicator Panel

The indicator panel is attached to the front panel and contains the power lamp, hard disk drive busy lamp, and reset button. The indicator panel attaches to the system board using connector P5 (reset connector), P7 (hard disk drive busy lamp connector), and P15 (power lamp connector).

Technical Information 1-17

POWER SUPPLY

The power supply is mounted inside the system unit. It supplies power to the system board, option boards, diskette drives, hard disks, keyboard, and mouse. Two connectors connect the power supply to the system board. A fan inside the power supply provides proper ventilation for the system. The power supply in the desktop supplies 145W of power. The minitower power supply provides 200W. Power requirements and specifications for both power supplies are provided in Appendix C.

DISKETTE DRIVE

Up to two diskette drives are supported in the system. The drives are connected by a single ribbon cable with two drive connectors. The system refers to the diskette drives as A and B. Drive A is for the first drive, B is for a second optional diskette drive. The diskette drive cable plugs directly into the system board. Typically both diskette drive are terminated. See Section 3, Options, for installing an optional 5 1/4-inch diskette drive.

Specifications for the diskette drives are provided in Appendix B, Specifications.

HARD DISK DRIVE

The system provides IDE interface connectors on the system board. The system board supports up to two IDE devices on the standard connector and two IDE devices on the fast local bus IDE connector. The system unit provides one storage slot for a 3 1/2-inch hard disk (1-inch height), and one available storage slots for a optional 5 1/4-inch device (1.6-inch height). See Section 3, Options, for installing an optional hard disk drive.

Specifications for the diskette drives are provided in Appendix B, Specifications.

KEYBOARD

The PS/2-style keyboard is standard equipment for the system. The keyboard provides a numeric keypad, separate cursor control keys, and 12 function keys, capable of up to 48 functions. Status lamps on the keyboard indicate: Num (Numeric) Lock, Caps (Capital)

Lock, and Scroll Lock key status. The keyboard's six-pin connector is plugged into the rear of the base unit. The PS/2-style keyboard connector pin assignments are given in Appendix A, Connector Pin Assignments.